Xbox Live has been hit by a service alert as scheduled maintenance takes place, which should be ending shortly. The Xbox Live status page indicates that matchmaking in Grand Theft Auto V's Online and Call of Duty: Black Ops II is affected, as is Xbox One. It should be returning to normal as we write this.

"If you were having trouble matchmaking on either Grand Theft Auto V, or Call of Duty: Black Ops II due to the maintenance taking place, worry not, Xbox members! The work is complete, and matchmaking features are now functioning normally. Thanks for being patient during this time," reads the latest update on the Xbox Live service status page.